Research And Design Of The Fifth Generation Terminal Antenna

With the development and iteration of mobile communications and wireless systems,5G is gradually becoming the mainstream communication technology due to its low latency and large bandwidth compared to the previous generation.As one of the important mobile network access terminals,the mobile phone is generally composed of three parts: baseband,radio frequency and antenna.The antenna is used as a port for receiving and transmitting signals,and its radiation performance directly affects the mobile phone's communication performance.Since the channel capacity of the system is proportional to the number of antennas used for transmission and reception,multiple input and multiple output antennas are currently the mainstream design form of terminal antennas.However,the development direction of the mobile phone shape reduces the space left for the antenna,such as a larger screen ratio and more sensors,which makes the design of the mobile phone antenna more complicated.How to integrate multiple compact antennas with different operating frequency bands and good isolation into a limited space will be a serious challenge for antenna engineers.This article combines the current application background and researches on the design of mobile phone MIMO antennas.By combining existing literature,it analyzes the research status and research directions at home and abroad,and makes basic forms,key technologies and technical indicators of mobile phone MIMO antennas.In conclusion.According to application requirements,three MIMO antennas for 5G smart phones were designed.Firstly,a six-element slot antenna is designed,which can work in the n78 and n79 frequency bands.By loading a circular parasitic structure on the gap,an effective way to extend the current and achieve the purpose of miniaturization;by optimizing the spacing and position of the antenna elements,the isolation is improved.The measured results show that the antenna's parameters such as return loss,isolation and radiation pattern meet the working requirements.The SAR value of the head is simulated and the ECC value is calculated.Secondly,an eight-element inverted-F antenna was designed,and the antenna elements all work in the n78 frequency band.The antenna size is reduced by folding the antenna or introducing capacitive coupling,and the isolation between the units is improved by adding a floor gap.The measured results show that all the parameters of the antenna meet the working requirements,the antenna model at hand is simulated,and the SAR and ECC values of the head are calculated.Finally,an eight-unit multi-mode mobile phone antenna is proposed.Two 4G antennas can work in B1,B38,B40,B41 and other frequency bands.The addition of coupling branches expands its working bandwidth.The use of prominent and neutral line structure improves the unit Between the isolation,the 5G dual-frequency PIFA antenna loaded with a J-shaped slot can work in the n78 and n79 bands.The SAR value of the head is simulated,and the ECC value is calculated by simulating the scattering parameters.